A crane places a prefab module during construction of 219 Roe Ave. The couple’s neighbours were ‘very supportive,’ says Mr. Yen, partly because he was very open about what he planned to do, but also because ‘the time-efficiency also gains their support, because I can tell them that we’ll have one day of cranes instead of a year of messiness.’ The tractor-trailer can transport a module 16 feet wide, 56 feet long and with an 11-foot ceiling. Mr. Yen and Ms. Ma were able to achieve 13-foot ceilings by cutting the floor and dropping it down into the foundation.